JPS6457895A - Supervisory and control system - Google Patents

Supervisory and control system

Info

Publication number
JPS6457895A
JPS6457895A JP21405887A JP21405887A JPS6457895A JP S6457895 A JPS6457895 A JP S6457895A JP 21405887 A JP21405887 A JP 21405887A JP 21405887 A JP21405887 A JP 21405887A JP S6457895 A JPS6457895 A JP S6457895A
Authority
JP
Japan
Prior art keywords
signal
slave station
circuit
logic circuit
monitor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP21405887A
Other languages
Japanese (ja)
Inventor
Masabumi Sueoka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP21405887A priority Critical patent/JPS6457895A/en
Publication of JPS6457895A publication Critical patent/JPS6457895A/en
Pending legal-status Critical Current

Links

Landscapes

  • Selective Calling Equipment (AREA)

Abstract

PURPOSE:To supervise a slave station by a master station at all times by using a control signal and a maintenance telephone signal applying the control of the processing operation of the slave station to use one frequency band in common. CONSTITUTION:A maintenance telephone circuit 4 is connected to a maintenance telephone circuit 24 by switching circuits 5, 25 in a normal state. When the master station 1 controls the processing operation of the slave station 2, a switch 6 changes over the switching circuit 5 to connect a control logic circuit 7 to a line 18. Then the control logic circuit 7 sends a carrier signal to switch the switching circuit 25 in the slave station 2 and the control logic circuit 27 switches the switching circuit 25. Moreover, a monitor logic circuit 10 in the master station 1 is always connected to a monitor logic circuit 20, the slave station 2 outputs a monitor signal 21 to obtain a monitor signal 11 in the master station 1. That is, the control signal and the maintenance telephone signal use one frequency band in common and the frequency band of the monitor signal is made independent to allow the master station to supervise the slave station at all times.
JP21405887A 1987-08-27 1987-08-27 Supervisory and control system Pending JPS6457895A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21405887A JPS6457895A (en) 1987-08-27 1987-08-27 Supervisory and control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21405887A JPS6457895A (en) 1987-08-27 1987-08-27 Supervisory and control system

Publications (1)

Publication Number Publication Date
JPS6457895A true JPS6457895A (en) 1989-03-06

Family

ID=16649564

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21405887A Pending JPS6457895A (en) 1987-08-27 1987-08-27 Supervisory and control system

Country Status (1)

Country Link
JP (1) JPS6457895A (en)

Similar Documents

Publication Publication Date Title
JPS57157661A (en) Transmission line switching system
JPS647726A (en) Radiotelephone system
JPS6457895A (en) Supervisory and control system
JPS6472697A (en) Device for automatizing distribution line
JPS5566151A (en) Two-way transmission system
JPS6427334A (en) Duplex switching system
FR2391608A1 (en) Establishing and maintaining telephonic links - involves two=stage process requiring call treatment and connection
JPS56149851A (en) Looplike data transmission equipment
JPS5630338A (en) Signal change-over system
JPS5637734A (en) Frequency dividing device
JPS55130244A (en) Radio communication unit
JPS6443041A (en) Automatic power distribution line monitoring device
JPS566589A (en) Multifrequency signal sending circuit
JPS6419833A (en) Console for communication
JPS648736A (en) Answer-back system
JPS5392614A (en) Transmission switching system of microwave multiple radio
JPS5391508A (en) Transmission control system for sound signal
JPS56156049A (en) Connecting system of circuit terminal
JPS5637766A (en) Automatic telephone switching device for telemeter
JPS57112141A (en) System for line switching
JPS57125547A (en) Dataway extender
JPS554127A (en) Signal selector circuit
JPS54132110A (en) Circuit network switching system
JPS5792953A (en) Line switching system
JPS5460676A (en) Sequencer